The baby takes what it needs from you first so I wouldn't worry about it. With my first I was extremely sick I practically lived at the hospital throwing up all day and night for nine months, my baby was still healthy and Dr didn't worry about it
are you taking vitamins? how far along are you?
My doc had me take vitamin B6, it helps with the nausea. As for if the baby is getting the nutrients I'm not sure. Best of luck my dear.